LM3S9997 Datasheet, PDF (828/1218 Pages) Texas Instruments – Stellaris® LM3S9997 Microcontroller

Universal Serial Bus (USB) Controller
Table 20-1. Signals for USB (100LQFP) (continued)
Pin Name
Pin Number Pin Mux / Pin Pin Type Buffer Type^a Description
Assignment
USB0DP
71
fixed
I/O
Analog Bidirectional differential data pin (D+ per USB
specification).
USB0EPEN
19
PG0 (7)
O
24
PC5 (6)
34
PA6 (8)
72
PB2 (8)
83
PH3 (4)
TTL
Optionally used in Host mode to control an external
power source to supply power to the USB bus.
USB0ID
66
PB0
I
Analog This signal senses the state of the USB ID signal.
The USB PHY enables an integrated pull-up, and
an external element (USB connector) indicates the
initial state of the USB controller (pulled down is
the A side of the cable and pulled up is the B side).
USB0PFLT
22
PC7 (6)
I
23
PC6 (7)
35
PA7 (8)
65
PB3 (8)
74
PE0 (9)
76
PH4 (4)
87
PJ1 (9)
TTL
Optionally used in Host mode by an external power
source to indicate an error state by that power
source.
USB0RBIAS
73
fixed
O
Analog 9.1-kΩ resistor (1% precision) used internally for
USB analog circuitry.
USB0VBUS
67
PB1
I/O
Analog This signal is used during the session request
protocol. This signal allows the USB PHY to both
sense the voltage level of VBUS, and pull up VBUS
momentarily during VBUS pulsing.
a. The TTL designation indicates the pin has TTL-compatible voltage levels.
Table 20-2. Signals for USB (108BGA)
Pin Name
USB0DM
Pin Number Pin Mux / Pin
Assignment
C11
fixed
USB0DP
C12
fixed
USB0EPEN
USB0ID
K1
PG0 (7)
M1
PC5 (6)
L6
PA6 (8)
A11
PB2 (8)
D10
PH3 (4)
E12
PB0
USB0PFLT
L2
PC7 (6)
M2
PC6 (7)
M6
PA7 (8)
E11
PB3 (8)
B11
PE0 (9)
B10
PH4 (4)
B6
PJ1 (9)
Pin Type
I/O
I/O
O
I
I
Buffer Type^a Description
Analog
Analog
TTL
Bidirectional differential data pin (D- per USB
specification).
Bidirectional differential data pin (D+ per USB
specification).
Optionally used in Host mode to control an external
power source to supply power to the USB bus.
Analog
TTL
This signal senses the state of the USB ID signal.
The USB PHY enables an integrated pull-up, and
an external element (USB connector) indicates the
initial state of the USB controller (pulled down is
the A side of the cable and pulled up is the B side).
Optionally used in Host mode by an external power
source to indicate an error state by that power
source.
828
June 15, 2010
Texas Instruments-Advance Information